javascript基本语法

<script type="text/javascript">
    var socer = parseInt(window.prompt(‘input‘));
    if (socer > 90 && socer <= 100) {
        document.write(‘优秀‘);
    } else if (socer > 80 && socer <= 90) {
        document.write(‘合格‘)
    } else {
        document.write(‘不合格‘);
    }
</script>

方法一：
<script type="text/javascript">
    for (var i = 0 ; i < 10  ; i++){
        document.write(‘a‘);
    }
</script>

方法二：
<script type="text/javascript">
    var i = 1;
    count = 0;
    for (; i ;) {
        document.write(‘a‘);
        count ++;
        if (count == 10) {
            i = 0;
        }
    }
</script>